Explanatory notes
… is limited to the following base metals, their alloys, and articles thereof which are not more specifically covered … magnesium (heading 81.04), cobalt, including cobalt mattes and other intermediate products of cobalt metallurgy … rhenium, thallium, cadmium, germanium, vanadium, gallium, indium and niobium (columbium) (heading 81.12). This Chapter …